The Degree of Normal Menstrual Irregularity**Contribution No. 245. Acknowledgment is due several persons who have supplied information to further the completion of this report. Drs. E. Allen, C. F. Fluhmann, J. L. King, L. J. Latz, J. P. Pratt, and M. C. Shelesnyak have cooperated by sending miscellaneous, supplementary data to clarify and extend their published accounts of group studies.

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